def load(self, file_name):
""" Loads a snapshot storage
Args:
file_name: Can be either a directory with numbered .csv files, or a
numpy pickle (.pkl)
"""
if not self.in_memory:
raise IOError("Can't load from file because in-memory storage is disabled.")
if not os.path.exists(file_name):
raise IOError("Specified file does not exist.")
if file_name.endswith(".pkl"):
self._snapshots = np.load(file_name)
else:
self._snapshots = util.load_snapshots(file_name)
self.snapshot_shape = self._snapshots.shape[1:]
self.max_snapshots = self._snapshots.shape[0]
self._reserved_length = self.max_snapshots
self._current_index = self.max_snapshots
self.snapshot_count = self.max_snapshots
parser = argparse.ArgumentParser(description="Render nbody simulation results.")
parser.add_argument("directory", help="directory with all of the simulation files in a .csv format, or a pickled snapshot file")
parser.add_argument("-c", "--color", type=str, help="specifies in what color to draw the bodies. If not set all bodies are drawn in different colors", choices=['b', 'g', 'r', 'c', 'm', 'y', 'k', 'w'])
parser.add_argument("-s", "--speed", metavar="fps", type=int, default=20)
parser.add_argument("-t", "--timesteps", metavar="num", type=int, default=1, help="displays previous body states up to the amount specified. Set to 0 to display all states")
parser.add_argument("-f", "--fade", action="store_true", help="specifies whether bodies from previous time steps should fade")
parser.add_argument("-o", "--out", metavar="path", type=str, help="if specified will output video to file")
parser.add_argument("-v", "--verbose", action="store_true", help="prints the current frame number to the terminal while drawing")
args = parser.parse_args()
bodies = None
if args.directory.endswith(".pkl"):
bodies = cPickle.load(args.directory)
else:
bodies = util.load_snapshots(args.directory)
color = cm.get_cmap()
if args.color:
color = args.color
verbose_level = 1
if args.verbose:
verbose_level = 2
body_renderer = SnapshotRenderer(bodies, line_style="-", marker_style=".",
history_length=args.timesteps, fade=args.fade,
color=color, fps=args.speed, verbose=verbose_level)
body_renderer.run(out_file=args.out)
'''
